JPH0365995A - Musical sound synthesizer - Google Patents

Abstract

PURPOSE:To easily generate a musical sound of high-order resonance frequency by switching arithmetic coefficients for the arithmetic processing of a signal scatter junction corresponding to pitch operation. CONSTITUTION:The arithmetic coefficients for the arithmetic processing of the signal scatter junction 20 are switched corresponding to the pitch operation. Part of the exciting signal sent out of an exciting means 10 is sent back by the signal scatter junction 20 and fed back to the exciting means 10. Therefore, the transmission quantity frequency characteristics of a resonance circuit 30 are affected by the state of signal scattering by the signal scatter junction 20 and the balance of the gain of each resonance frequency can be adjusted by adjusting the coefficient for the arithmetic processing by the signal scatter junction 20. Consequently, the musical sound of high-order resonance frequency can easily be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a musical tone synthesis device particularly suitable for use in synthesizing evaporated sounds of wind instruments.

] ゛Prior Art'' A method is known in which a model obtained by simulating the sound production mechanism of a natural musical instrument is operated, and thereby the musical tones of the natural musical instrument are synthesized. The most basic model of a wind instrument such as a larinet is a model with a closed-loop structure that connects a nonlinear amplification element that simulates the elastic characteristics of a reed and a bidirectional transmission circuit that simulates a resonant tube. There is. In this model, when a signal is output from the nonlinear amplification element, this signal is input to the bidirectional transmission circuit as a traveling wave signal, reflected at the end of the bidirectional transmission circuit, and this reflected wave signal is transmitted bidirectionally. It is fed back to the nonlinear amplification element via the circuit. In this way, the propagation of air pressure waves in a wind instrument is faithfully simulated by a closed loop circuit consisting of a nonlinear amplification element and a bidirectional transmission circuit.

In addition, actual wind instruments are provided with holes for controlling pitch, so-called tone holes, and models that simulate wind instruments including these tone holes are known. In this model, a signal processing circuit called a signal scattering junction (hereinafter abbreviated as junction) is inserted between each bidirectional transmission circuit in correspondence with the tone hole. Each junction performs arithmetic processing such as coefficient multiplication on each input signal from an adjacent bidirectional transmission circuit, and the arithmetic results are supplied to the adjacent bidirectional transmission circuit.

The multiplication coefficients and the like in this arithmetic processing are switched depending on the open/closed state of the tone hole.

In this case, the signal fed back to the nonlinear amplification element is the sum of the components folded back at each junction. Moreover, as mentioned above, since the multiplication coefficient for calculation in each jack switch is switched corresponding to the open/closed state of the tone hole, the transmission amount frequency characteristic when looking from the nonlinear amplification element to the bidirectional transmission circuit side. is switched according to the open/closed state of the tone hole.

This transmission amount frequency characteristic is the frequency (first order) corresponding to the delay time until the output signal of the nonlinear amplification element is folded back at the junction corresponding to the open tone hole and fed back to the nonlinear amplification element, and its integer. This results in multimodal characteristics having a resonant frequency at each frequency (higher order). Note that this type of technology is disclosed in, for example, Japanese Patent Application Laid-Open No. 63-40.
Public No. 199.

The information section is shown.

``Problem to be Solved by the Invention'' By the way, when actually playing a wind instrument, for example, by adjusting the strength of the blowing pressure, the resonant tube is caused to resonate at the first resonance frequency determined by the open position of the tone hole, It is relatively easy to resonate or switch at a high-order resonant frequency.

However, although the conventional musical tone synthesizer described above can obtain multimodal resonance characteristics, it has a problem in that it is difficult to control it so as to obtain resonance at a high-order resonance frequency. The present invention has been developed in view of the above-mentioned circumstances, and an object of the present invention is to provide a musical tone synthesis device that can easily generate musical tones with high-order resonance frequencies.

"Means for Solving the Problems" In order to solve the above problems, the present invention provides: excitation means that outputs an excitation signal based on an input signal and a feedback signal; and processing the excitation signal and outputs the feedback signal. The means includes: (a) a plurality of bidirectional signal processing means that performs predetermined signal processing on input signals in both forward and reverse directions and outputs the respective signals; (b) an intermediary between the bidirectional signal processing means; At least one signal scattering device connected to the device, which performs predetermined arithmetic processing on the output signal from each of the connected bidirectional signal processing means, and supplies the result of the arithmetic operation as an input signal to the bidirectional signal processing means. a resonant circuit constituted by a junction, so as to respond to pitch manipulation, switch arithmetic coefficients for arithmetic processing in the signal scattering junction, and adjust the balance of gains at each resonant frequency of the resonant circuit; It is characterized by what it did.

"Operation" According to the above configuration, a part of the excitation signal output from the excitation means is folded back at the signal scattering junction and fed back to the excitation means. Therefore, the transmission frequency characteristics of a resonant circuit are influenced by the state of signal scattering performed by the signal scattering circuit, and by adjusting the arithmetic processing coefficients in the signal scattering circuit, the gain balance at each resonance frequency can be adjusted. :JIY1 is possible.

"Example" Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a musical tone synthesizer according to an embodiment of the present invention. Furthermore, FIG. 2 is a diagram showing the configuration of a physical model of a clarinet simulated by this musical tone synthesis device.

First, the physical model shown in FIG. 2 will be explained.

In FIG. 2, 1 is a resonance tube (tube section) of a wind instrument, 2 is a mouthpiece section, 2a is a reed, TH is one tone hole formed in the resonance tube 1, and RTC is a register tube.

The clarinet's sound production mechanism will be explained below with reference to this physical model. When a blow player holds the mouthpiece portion 2 in his mouth and blows into it, the reed 2a is displaced due to the blowing pressure P and its own elastic properties (arrow 2S). As a result, an air pressure wave (compression wave) is generated inside the tube of the lead 2a, which becomes a traveling pressure wave F and is sent toward the terminal end IE of the resonance tube l. Then, the traveling pressure wave F is reflected at various places in the resonance tube l and at the terminal end lE, and returns to the lead 2a as a reflected pressure wave R, and the lead 2a receives the pressure PR from the reflected pressure wave R. Therefore, while playing,
The total pressure PA that the lead 2a receives is PA = P - PR (1), where the pressure of the reflected pressure wave R is PR.In the end, the lead 2a has its own elastic characteristics and the above pressure PA. vibrates due to Then, the vibration of the reed 2a and the reciprocating motion of the pressure waves F and R within the resonance tube 1 resonate, thereby generating a musical tone.

The primary resonance frequency at this time is switched by opening and closing the tone hole TH formed in the resonance tube l. That is, when the tone hole TH is opened or closed, the flow of pressure waves near the tone hole TI changes accordingly, and the effective length of the resonance tube 1 changes, causing the resonant frequency to be switched. It will be done.

Hereinafter, the state of the air pressure wave at a point j near the tone hole TH of the resonance tube l will be explained.

When the tone hole TH is open> When the tone hole TH is open, the air pressure Pj at point J
is P j=a+off P 14 +azorf P x
+asof'f P 3+ (2). Here, P1+ is lead 2a (fi
The pressure of the air pressure wave flowing from ll to point j, P, + is the pressure of the air pressure wave flowing from the end IE side of resonance tube 1 to point j, and 15 is the air pressure flowing from tone hole TH. Indicates wave pressure. Also, anorf, atof
r and aaofr are coefficients corresponding to the contribution of each air pressure wave flowing into point j to the air pressure Pj at point j, and are given by the following equations (3) to (5).

a+orr=2φl! /(φ,!+φ1+φ,t)
−・−・・(3) a, orr= 2φ? /(φl!+φ
? +φ3ri...(4)asorr=2. φ,
'/(φ,!+φe+φ3'') −・−・−(5) Here, φ1 is the diameter of the resonant tube l on the lead 2a side, φ
, represents the diameter of the terminal end IE side of the resonance tube I, and φ represents the diameter of the tone hole TH.

On the other hand, in FIG. 2, from point J to lead 2a of resonance tube l
The pressure of the air pressure wave flowing out in the direction of the resonance tube end IE is P, -1, and the pressure of the air pressure wave flowing out in the direction of the resonance tube end IE is P, -1.
Then, these are each P, -= pj-pi+ .
...(6) P @-= P J P r+
−−(7) Ps−=pj−Pi+ ・・・・・・(8)
becomes.

An air pressure wave (pressure P
l) eventually reaches the terminal end IE and part of the lead 2a
'III, but in the case of a wind instrument with an open end, such as a clarinet, the phase is reversed during this reflection. Also, if tone hole 1゛1■ is open,
The air pressure wave (pressure P, -) flowing out from point j toward the outside of the tone hole TH is reflected at the opening, but in this case as well, the traveling wave is reflected in the opposite phase.

<When the tone hole TH is in an open state> In this case, it is considered to be equivalent to a state in which the diameter φ of the tone hole TH becomes O. Therefore, the above formula (3) ~
By substituting φ,=0 into (5), a coefficient atolL axon corresponding to the contribution of each air pressure wave to the air pressure Pj when the tone hole 1'H is in a closed state,
ason is derived as shown in formulas (9) to (11) below.

a+on= 2φl'/(φl'+φt') ・-・
-(9) aton=2φ1/(φ1'+φ1')...
...(1O) a=on= O= ”・(l l ) Then, the air pressure Pj at point j is P j=a, on P , + 10 axon P t+
ason P 3+ (12).

Signals reflected at various points in the resonance tube 1 as described above are fed back to the lead 2a, and the primary resonance frequency is determined by the most effective component of the signals. When the tone hole TH is open, the primary resonance frequency is determined by the time required for the air pressure wave to travel back and forth between the beam 2a and the tone hole TH. In addition, the transmission frequency characteristic of the resonance tube l in this case is a multimodal characteristic in which the transmission gain is maximum at the first-order resonance frequency and higher-order resonance frequencies 3 times, 5 times, etc. becomes.

Next, the resistor tube RTC will be explained.

As mentioned above, the resonance tube l of a wind instrument has multimodal transmission frequency characteristics, but the resistor tube RTC is provided to promote resonance at a higher resonance frequency in the resonance tube l. be. Among existing wind instruments, there are wind instruments that are equipped with holes (called octave keys) corresponding to register tubes RTC in order to facilitate pitch switching over one octave or more. As shown in Figure 4,
At points near the resistor tube RTC, scattering of air pressure waves occurs. Q I ”* Q t ”r Q S
+ is the pressure of the air pressure wave flowing into the neighboring point k, Q, -, Q
,−,Q,− is the pressure of the air pressure wave flowing out from the neighboring point k. When the resistor tube RTC is closed,
The components of the air pressure wave that are returned to the lead 2a are predominantly those that are reflected and returned at the tone hole TH or the end portion IE. On the other hand, resistor tube RTC
When the resistor tube RTC becomes open, the scattering of air pressure waves at the resistor tube RTC becomes significant, so that the component reflected at the resistor tube RTC is emphasized in the air pressure wave that is fed back to the lead 2a. Incidentally, since the scattering of the air pressure wave at this point k is the same as that at the point j near the tone hole TH described above, a quantitative explanation of ff[ will be omitted here.

Next, the musical tone synthesis apparatus shown in FIG. 1 constructed based on the physical model shown in FIG. 2 will be explained. In the figure, an excitation circuit 10 corresponds to the mouthpiece section 2 in FIG. 2, and a resonant circuit 30 corresponds to the resonant tube l. Also,
The junction 20 interposed between the excitation circuit IO and the resonance circuit 30 simulates the scattering of air pressure waves at the connection between the mouthpiece section 2 and the resonance tube 1.

In this junk cylinder 20, the output signal from the resonant circuit 30 and the output signal from the excitation circuit 10 are added by addition k18 and input to the resonant circuit 30.

The output signal of the adder 18 and the output signal of the resonant circuit 30 are added by an addition W19 and input to the excitation circuit 10.

The excitation circuit 10 includes a subtracter 11, filters 12 and 13
, adder 14, ROM 15, multipliers 16, 17 and I
It consists of NV. When a musical tone is generated, information corresponding to the blowing pressure P and the embouchure E (the pressure when the mouthpiece is held in the mouth) is given from the musical tone control circuit °100. The subtracter 11 receives signals input from the resonance circuit 30 via the junction 20, that is, a signal corresponding to the air pressure PR of the reflected wave R from the resonance tube 1 in FIG. 2, and a signal corresponding to the blowing pressure P. is done manually. Then, the above formula (1) is calculated, and a signal corresponding to the air pressure PA applied to the lead 2a is obtained.

The output signal of subtraction Wll is band limited by filter 12. This filter 12 is constituted by a first-order low-pass filter, and is controlled to prevent the amplitude of the signal circulating between the excitation circuit 10 and the resonant circuit 30 from becoming significantly large at a specific frequency. The output signal P of the filter 12 is inputted to the filter 13 and inverted by the multiplier INV.
6 is input. The signal P passes through the filter 13 to remove high frequency components. This simulates the response characteristics of the reed 2a that absorbs sudden pressure changes.

Then, the adder 14 adds a signal corresponding to the embouchure E to the output signal Pl of the filter 13, and obtains a signal Pl corresponding to the pressure actually applied to the lead. This signal Pl is then given to the ROM 15 as an address. As a result, a table of nonlinear functions stored in advance in the ROM 15 is referred to, and the cross-sectional area of the gap between the reed 2a and the mouthpiece portion 2, that is,
A signal Y corresponding to the admittance to the airflow is output. Then, the signal Y and the signal -Pl are multiplied by the multiplier 16, and a signal FL corresponding to the flow velocity of air passing through the gap between the reed 2a and the mouthpiece portion 2 is obtained.

Then, the multiplier 17 multiplies the signal FL by a multiplication coefficient G. Here, the multiplication coefficient G is a constant determined according to the pipe diameter near the attachment of the mouthpiece part 2 in the resonance pipe l, and the difficulty in passing the airflow, that is,
It corresponds to the impedance to air flow.

Therefore, multiplication? 317 provides a signal corresponding to the air pressure change occurring at the mouthpiece side inlet of the resonance tube l. And this signal is junction 20
The signal is input to the resonant circuit 30 via.

In the resonant circuit 30, delay circuits D jl, D kl
', Dir%D m? , Dk? , D jr is
Each corresponds to the propagation path of the air pressure wave in the resonant tube l of FIG.

More specifically, the lead 2a and the resistor tube RT
The propagation delay of the air pressure wave between the resistor tube RTC and the tone hole TH is simulated by the delay circuits Dkf and Dkr, the propagation delay of the air pressure wave between the tone The propagation delay between the hole TH and the termination IE is simulated by the delay circuits DIl' and Dn?.

When the output signal of the resonant circuit 30 is input to the termination circuit TRM, it is band-limited by the low-pass filter ML, further multiplied by a negative reflection coefficient DE by 51V, and returned to the resonant circuit 30. In this way, the frequency characteristics of the acoustic loss at the termination IE and the phase inversion accompanying reflection are simulated.

The junction JTH in the resonant circuit 30 simulates the scattering of air pressure waves at a point j near the tone hole TH in FIG.
Multiplier M, , M□M s , M 4, subtractor A 1.
It is composed of At, As, delay circuits DTH,, DTH, and a low pass filter LPFTH. Addition Aj
, the output signal of the delay circuit Dkf (pressure P1+ in Fig. 2)
) is multiplied by the coefficient at by the multiplication field Ml,
The output signal of the delay circuit Dlr (pressure P in Fig. 2).

(corresponding to
A signal obtained by multiplying the coefficient a by a multiplier M is input. In addition, each coefficient al+82183 corresponds to the opening/closing of the tone hole TH, and the coefficient aI
ort* a*oH+ a! oN or coefficient a IO
n Ta t On , a, within 0 is given.

These coefficients are calculated using the above equations (3) to (5) based on the actual resonance tube and tone hole diameters φ, ~φ, for boat fishing.
) or (9) to (11), but in the case of this musical tone synthesizer, the register tube R
Corresponding to the opening/closing operation of TC, each coefficient is calculated by shifting the diameter φ from the actual value. Note that this matter will be explained in detail later.

Then, the addition result of the adder Aj, that is, the signal corresponding to the air pressure PJ at the point J, is input to the subtraction registers A1%A1 and A3. Then, in subtractor A, add '
? The output signal (pressure P, equivalent to 10) of the delay circuit Dkr is subtracted from the output signal of 3 A j, and the subtraction result (pressure P.

- equivalent) is sent to the delay circuit Dkr. Also, subtraction ′A
At tAt, delay circuit 1) or
The output signal (pressure P, equivalent to 10) is subtracted, and the subtraction result (
pressure Pr) is sent to the delay circuit Da+r. Furthermore, subtraction 'a A 3 is addition? The output signal of the delay circuit DTH (corresponding to a pressure of 15 mm) is subtracted from the output signal of +sAj, and the subtraction result (corresponding to a pressure P, -) is sent to the delay circuit DTH.

The signal input to the delay circuit DTH is delayed by a predetermined time and then input to the low-pass filter L P F T H, where the sound g loss at the tone hole opening is added. Then, the output signal of the low-pass filter LPFTH is multiplied by the reflection coefficient the for the air pressure wave at the opening of the tone hole T I4 by the multiplication factor M a.

The multiplication result of the multiplier M4 is then delayed by the delay circuit DTH and input to the subtractor 5A and the multiplier M. Delay circuit °DTH, and DTH.

The delay time is equal to the height of the tone hole TH, that is, the time required for the air pressure wave to travel back and forth across the cylindrical portion of the tone hole TI4. In this way, the propagation of the air pressure wave at the point j near the tone hole TH described above is simulated.

Junction J RTC is provided to calculate scattering of air pressure waves of resistor tube RTC.

Here, each multiplication coefficient bl+bt, bs is each diameter φlTh+φ! corresponding to the resistor tube RTC. b+φ,
It is determined based on b. Furthermore, LPFRTC is a low-pass filter that provides sound W loss when the resistor tube RT CnH is released, and DRTC and DRTC8 are delay circuits that have a delay time depending on the height of the resistor tube RTC. Also, the reflection coefficient rtc is the resistor tube RT
It can be switched according to the opening and closing of C. Note that the configuration of the junction JRTC is exactly the same as that of the junction JTH, and the only difference is in the coefficients used for calculations as described above. Therefore, Junction JR
A detailed explanation of the configuration regarding 'r'C will be omitted.

Now, the delay circuit Dlr in this musical tone synthesizer.

Dj? , D kf, D kf, D ir, D
Il? Each has a plurality of delay elements, and is configured to be able to switch and control the number of stages of delay elements that contribute to signal delay. The delay stage number data Q1 is stored in the delay circuits Dir and Djr, and the delay circuits Dkf and Dk? The delay stage number data el is given to the delay circuits Dar and Dmr, and the delay stage number data m is given to the delay circuits Dar and Dmr from the musical tone control circuit lOO, and the distribution of these delay times is switched according to the position of the tone hole TH to be opened. It has become. In addition, as a specific circuit of this type of delay circuit that can control the delay time, for example, an input signal is input to a shift register driven by a shift clock of a predetermined frequency, and a desired one of the outputs of each stage of the shift register is input. It is possible to use a method in which a selector or the like selects and outputs a signal corresponding to the delay time of .

Here, the control of the distribution of delay time corresponding to the above-mentioned opening/closing operation of the tunnel hole will be described in detail. Now, it is assumed that the tone hole TH in FIG. 2 is in an open state among the many tone holes provided in the resonance tube 1, and is the tone hole closest to the lead 2a. In this case, the sum of the delay stage number data el and h is equal to the delay stage number n corresponding to the distance from the lead 2a to the tone hole position, and the ratio of the delay stage number el to the delay stage number n is constant. is set to the value. Furthermore, if the number of delay stages corresponding to the total length of the resonance tube l is Qs, then iA= (ls
−n stage data garden is the delay circuit Dmf and I)++
supplied to r. In this way, the delay time of each delay circuit is set. The junction JT11 is supplied with the coefficients Lofr, atorr, and tisorr, and -l is supplied as the reflection coefficient the to both of them.

On the other hand, when all the tone holes are covered with fingers, the stage number data n and margin are determined corresponding to the tone hole position closest to the terminal IE. And Junction J
TH has the coefficient a + On r 810 n Ha
30^ is supplied, and l is supplied as the reflection coefficient the. In addition, in response to the opening/closing operation of the resistor tube RTC, the reflection coefficient r at the junction J RTC is
tc and multiplication coefficient bl+ by, bl for product-sum operation
can be switched.

A musical tone synthesizer having the configuration shown in FIG. 1 as described above was fabricated as a prototype, and the musical sound waveform was evaluated. Below, we will list and explain each parameter that was set for the prototype in this evaluation.

List of design parameters> [Filters] ◇Cutoff frequency of tone hole TH low pass filter LPFTH rcTII = 2500 EHzl ◇Resistor tube RTCI low pass filter LPFRTC
Cutoff frequency rcRTc = 7000 [Hz] ◇Cutoff frequency fcML of low-pass filter ML for terminal IE = 2000 [Hz] ◇Cutoff frequency rcdcr-15 of filter 13 (low-pass filter)
00 [Hz] [Number of delay circuit stages (number of shift register stages)
]◇Delay circuits D H, D kf and D mf (total number of delay stages of delay circuits Flj4DirrDk? and DIaυ (
(corresponds to the total length of resonance tube 1) (ltt = 82 ◇Total number of delay stages of delay circuits D3r and Dkr (delay circuits Dir and Dkt) (corresponds to the distance from lead 2a to tone hole TH) n: = 40 ◇Delay Circuit D i
Number of delay stages of r (delay circuit Dir) (corresponds to the distance from lead 2a to resistor tube RTC)12. = 10 ◇Number of delay stages in each of delay circuits DTH and DTH (corresponding to the height of tone hole TH) 5TI! = 1◇Number of delay stages for each of delay circuits D RT CI and D RT Cx (corresponding to the height of resistor tube RTC) 12R
TC= 2 [Tone hole TH related parameters] φ1=24 [
l1lIl] φ, = 24 [++ua] φ, is variable in the range of 8 to 48 [ms] Based on the values of these six diameters, the above multiplication coefficient a+of'r, 1itorr,
ii, oH was calculated and set to junction JTH.

Further, the reflection coefficient the was set to -1 (tone hole TH open state).

[Resistor tube RTC related parameters] φ, b
= 19 [+iil φ*b= 19 [as] φib= 3 [ii] Based on the values of these six diameters, the above multiplication coefficient rl! i,bI
o[, b*orr, bsorL b+oM+ ti=
on, bson, and junction J RTC
It was set to

Further, the reflection coefficient rtc was switched to two types: 1 (resistor tube RTC closed state) and -1 (resistor tube RTC open state).

[Other parameters] ◇ Multiplying coefficient of multiplier 17 (impedance to air flow of resonance tube l) G = 0.3 ◇ Reflection coefficient γ of multiplier IV of termination circuit TRM - -〇, 9 Then, each of the above parameters In the set state, the diameter φ of the tone hole TH is 8 [m++], 16 [n+m
], 48[m111], and for each case, the above coefficient A, on, axon, Aso
rr was calculated and given to Janxigon JTH, and the musical tone synthesizer shown in FIG. 1 was evaluated. In this evaluation, the excitation circuit 10 was separated from the musical tone synthesizer shown in FIG. 1, and point 1. Input an impulse from , observe the response at point [ , and apply FFT (fast Fourier transform) to the impulse response to obtain the transmission frequency characteristics shown in Figure 3 (a) and (b). Ta. In addition, FIG. 3(a) shows the reflection coefficient rtc for the resistor tube RTC when it is set to 1 (resistor tube RTC closed state), and FIG. 3(b) shows the rtc--
1 (resistor tube RTC open state).

As shown in these figures, as the diameter φ of the tone hole TH is increased to 8 [4 m], l 6 [question], 48 [==], the peak values of the gain in the first and second modes become as follows. It gets lower. Comparing the gain balance at each resonance frequency, for example, the tone pole diameter φ,
When is 8[1], the gain is maximum at the first-order resonance frequencies r, a, r, b, whereas the tone hole diameter φ,
is 48 [lll1], the third-order resonance frequency "sat
It can be seen that the gain is maximum at tab, and the order of the resonant frequency at which the gain is maximum is switched.

In this musical tone synthesizer, when the resistor tube RTC is closed and resonance is performed in the first-order resonance mode, the coefficient alo is calculated by making the diameter φ of the tone hole TH smaller than the actual one.
rr, atofr, 130rr to Junction J
TH, open the resistor tube RTC, and resonate in the third-order resonance mode, the diameter of the tone hole TH
The coefficient a, ofr, at which is calculated by making , larger than the actual value
orr, asofT are given to the junction JTI[, and by doing so, as can be easily understood from the above evaluation results, switching of the resonance mode is performed extremely easily.

As shown in FIGS. 3(a) and 3(b), the resonance frequency shifts slightly due to a change in the tone hole diameter φ, but this frequency shift is caused by delay circuits Dnf, Dmr, and Dmr.

D nr, D jr, D kf, D kr, D
This is corrected by adjusting the distribution of the delay time of jr.

In addition, in the above-mentioned embodiment, the case where the delay time of the traveling wave and the delay time of the reflected wave were made equal was explained, but the signal output from the excitation circuit IO
If the total amount of time until the signal is fed back to the excitation circuit IO via C, JTH, or termination circuit TRM is constant, even if the delay time for the traveling wave and the delay time for the reflected wave are unbalanced. I do not care.

"Effects of the Invention" As explained above, according to the present invention, there is provided an excitation means that outputs an excitation signal based on an input signal and a feedback signal, and an excitation means that processes the excitation signal and processes the *J1! A means for outputting a signal, comprising: (a) bidirectional signal processing means having a number of stages that performs predetermined signal processing on human input signals in each of the forward and reverse directions and outputs the respective signals; (b) each of the bidirectional signal processing means; At least one device connected between the two-way signal processing means, which performs predetermined arithmetic processing on the output signal from each of the two-way signal processing means connected thereto, and supplies the result of the arithmetic operation as an input signal to the two-way signal processing means. and a resonant circuit constituted by a number of signal scattering junctions, and corresponds to pitch operation, switches the calculation coefficient for calculation processing in the signal scattering junction, and balances the gain at each resonant frequency of the resonant circuit. ;l[
As a result, it is possible to easily generate musical tones with a high-order resonance frequency.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a musical tone synthesizer according to an embodiment of the present invention, FIG. 2 is a diagram showing a physical model of a clarinet simulated by the embodiment, and FIG. 3 is a diagram showing the L+, FIG. 7 is a diagram showing transmission amount frequency characteristics when looking at the resonant circuit 30 side from point Lt. J T H... Junction for tone hole, JRTC... Junction for resistor tube, DMf, Dir, DMf, DMf, Djr, Dk
f, Dkf, Dir--delay circuit, lOO...
Musical tone control circuit.

Claims (1)

[Scope of Claims] Excitation means for outputting an excitation signal based on an input signal and a feedback signal, and means for processing the excitation signal and outputting the feedback signal, comprising: (a) inputs in forward and reverse directions; a plurality of bidirectional signal processing means that performs predetermined signal processing on signals and outputs the respective signals; (b) interposed and connected between each of the bidirectional signal processing means and from each of the connected bidirectional signal processing means; a resonant circuit constituted by at least one signal scattering junction that performs predetermined arithmetic processing on the output signal of and supplies the result of the arithmetic operation as an input signal to the bidirectional signal processing means; 1. A musical tone synthesizing device, characterized in that, in response to an operation, arithmetic coefficients for arithmetic processing in the signal scattering junction are switched to adjust the balance of gains at each resonant frequency of the resonant circuit.